drop behind
fall
go backwards
disimprove
run
take a turn for the worse
freefall
make matters worse
require improvement
crash
come a gutser
misalter
worsen
disimprovement
fail at life
blow
lose ground
deterioratingly
pejorate
kick someone when they are down
exacerbate
go off the boil
be riding for a fall
suffer
bite the big one
deteriorate
atelophobia
come to grief
backfire
lag behind
worsening
reap the whirlwind
fritz
go down in flames
decline
go wrong
have one foot on a banana peel
snapper
do more harm than good
go south
misreform
deteriorationist
skunk
impair
stave
take on water
make heavy weather of
impairment
damage
harm
circle the drain
screw the pooch
deformation
pessimism
distortion
fight a losing battle
mess up
turn
act up
fizzle out
misfall
cack up
loserish
blunder
decay
fall flat on one's face
lose out
rot in hell
downtrend
worsener
loserhood
tatter
ameliorate
go to smash
suck a big one
confound
scantle
misadapt
starve
sap
scant
underwhelm
flawed
out of the frying pan, into the fire
below average
pessimization
fall away
backward
doggishness
die on the vine
flaw
go to pieces
bewill
misengender
drop the ball